It's very easy to use, have all of your APIs documented in one place so you can share easily with other teams or developers who don't work closely together (even if they're not using redOC).
The UI could be better for some types like Swagger 2/3 style docs but it really isn’t too hard once u get used! If I am working remotely then this makes collaboration super simple - especially useful when we are building out new services as there tends always at least 4 people involved during any project build up phase which would typically mean lots emailing back & forth just trying make sure everyone knows what each team member has done / does etc..